Abstract
The long-term changes in numbers of wintering goose species (Anser anser, Anser fabalis, Anser albifrons) were analyzed using data from Mid-winter International Waterbird Census in 1991–2007. Numbers of wintering Greylag Goose increased significantly in the Czech Republic as well as in Slovakia.
In Slovakia, significant increase in numbers was recorded in Great White-fronted Goose and on the contrary significant decline in Bean Goose. Wintering numbers of these both species fluctuated in the Czech Republic and population trend was classified as uncertain trend.
Inter-seasonal fluctuations of weather conditions did not influence significantly numbers of goose species. Nevertheless, in severe winter 2005/06, increase in number of wintering geese was recorded in wintering grounds in Slovakia.
On the contrary, higher numbers of wintering geese were counted in South Moravia ) in mild winter (e.g. January 2003, 2005, 2007).